Connecting joint between steel frame and core tube and construction method

Abstract

The invention provides a connecting joint between a steel frame and a core tube and a construction method. The connecting joint is used for solving the problem that earthquake energy cannot be effectively absorbed and dissipated in the prior art. The connecting joint comprises a core tube and a steel frame, the steel frame comprises a transverse rod and a longitudinal rod, an embedded fixing piece is arranged in the core tube and connected with a steel corbel, a connecting tube is fixed to the steel corbel, the opening direction of the connecting tube is perpendicular to the axis of the core tube, one end of the transverse rod slides along the connecting tube, and the other end of the transverse rod is fixedly connected with the longitudinal rod. And a driving device is arranged in the connecting cylinder and connected with an eccentric wheel, the eccentric wheel is hinged to a connecting rod through an eccentric shaft, the end, away from the connecting cylinder, of the connecting rod is hinged to the hinge seat, and the connecting cylinder is connected with the transverse rod through a reset device. The connecting rods are driven through the eccentric wheels connected with the driving devices, push-pull force can be generated on the steel frame under the earthquake action, part of earthquake force is effectively offset, and the earthquake resistance of the structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering structural engineering, and particularly to a connection node between a steel frame and a core tube. Background Art

[0002] In modern high-rise building structures, the combination form of a steel frame and a core tube is widely used due to its good bearing capacity and seismic performance. However, as an unexpected natural disaster, an earthquake poses a serious threat to the safety of building structures. Traditional connection nodes between a steel frame and a core tube all use high-strength bolts for connection, but it is often difficult to effectively absorb and dissipate seismic energy under earthquake action, which easily leads to structural damage and functional disorders. Chinese invention patent with the application number 202310024320.X discloses a frame-core tube structure with flexible energy dissipation connection, which achieves the effect of flexible energy dissipation by installing a viscoelastic isolation bearing between a steel corbel and a steel frame. There are the following defects in its solution: 1. The material of the isolation bearing is prone to aging and requires frequent maintenance; 2. Only the isolation bearing dissipates energy, and the effect of absorbing and dissipating seismic energy is not good. Summary of the Invention

[0003] The present invention provides a connection node and construction method between a steel frame and a core tube, which solves the problem that seismic energy cannot be effectively absorbed and dissipated in the prior art.

[0004] The technical solution of the present invention is realized as follows:

[0005] A connection node between a steel frame and a core tube includes a core tube and a steel frame. The steel frame includes a cross bar and a longitudinal bar. There is a pre-embedded component in the core tube, and the pre-embedded component is connected to a steel corbel. A connection cylinder is fixed on the steel corbel, and the opening direction of the connection cylinder is perpendicular to the axis of the core tube. One end of the cross bar slides along the connection cylinder, and the other end is fixedly connected to the longitudinal bar. An articulated seat is fixed on the side wall of the longitudinal bar. A driving device is arranged in the connection cylinder. The driving device is connected to an eccentric wheel. The eccentric wheel is articulated with a connecting rod through an eccentric shaft. The end of the connecting rod far away from the connection cylinder is articulated with the articulated seat. The connection cylinder is connected to the cross bar through a reset device.

[0006] Further, the driving device includes a bracket fixed in the connection cylinder. A driven rod rotates on the bracket. A gear is fixed on the driven rod. A rack meshing with the gear is fixed on the cross bar. The rack is arranged parallel to the cross bar. The driven rod penetrates through the connection cylinder, and the end of the driven rod outside the connection cylinder is fixedly connected to the eccentric wheel. Through the meshing of the gear and the rack, complex intelligent equipment is not required, which reduces the cost. At the same time, its design is simple and easy to implement, with high practicability and economy.

[0007] Furthermore, the crossbar is provided with a plurality of sliding grooves, each of which is provided with a plurality of spherical sliding members, the sliding members jointly support a support plate, a sleeve is fixed on the support plate, a longitudinal spring is provided in the sleeve, a guide cylinder is passed through the upper end of the connecting cylinder, the guide cylinder is sleeved with the sleeve, a detachable cover is provided at the top end of the guide cylinder, and the top end of the longitudinal spring is against the cover through a pressure sensor. Through the shock-absorbing and buffering effect of the longitudinal spring and the real-time monitoring and early warning function of the pressure sensor, the structural stability and safety of the building in an earthquake are effectively improved.

[0008] Furthermore, the reset device includes a limit plate, which is fixed to the open end of the connecting tube, and the limit plate is offset against the driving device through a transverse spring. The design of the reset device enables the connection node to better absorb and dissipate earthquake energy during an earthquake, thereby reducing the impact of the earthquake on the building structure.

[0009] Furthermore, a friction ratchet mechanism is provided on the driven rod, and the outer side of the friction ratchet mechanism is fixedly connected to the connecting tube. Since the friction ratchet mechanism can provide friction resistance for the driven rod, the structural damage caused by the shaking of the building is reduced, thereby reducing the maintenance cost.

[0010] Furthermore, the connecting rod includes a viscous damper, one end of which is hinged to the eccentric wheel through an upper hinge rod, and the other end of which is hinged to the hinge seat through a lower hinge rod. The combination of the viscous damper and the transverse spring achieves effective control of the sway of the building, while reducing the complexity and maintenance cost of the system.

[0011] Furthermore, both ends of the driven rod pass through the connecting tube, and both ends of the driven rod are respectively hinged to the hinge seat through connecting rods. The two sets of connecting rods enable the connection node to distribute stress and strain more evenly when subjected to force, reduce stress concentration at the node, and improve the force bearing performance and service life of the node.

[0012] The construction method of the connection node between the steel frame and the core tube includes the following steps:

[0013] S1: During the core tube construction phase, high-strength embedded fasteners are pre-embedded and vibrated twice to ensure tight integration with the core tube concrete;

[0014] S2: Fix the steel corbel to the embedded hardware. Ensure the horizontality and verticality of the steel corbel during installation.

[0015] S3: One end of the cross bar is inserted into the connecting tube, and the other end is fixedly connected to the longitudinal bar, and a hinge seat is installed at the end of the longitudinal bar away from the cross bar;

[0016] S4: A driving device is installed inside the connecting tube, the driving device is hinged to the connecting rod through the eccentric shaft of the eccentric wheel, and the other end of the connecting rod is connected to the hinge seat on the longitudinal rod;

[0017] S5: Install a reset device between the connecting cylinder and the cross bar to restore the initial position of the cross bar after an earthquake;

[0018] S6: After installing all components, conduct overall debugging to ensure smooth movement of each component, normal operation of the driving device, and reliable function of the reset device.

[0019] The beneficial effects that can be produced by this technical solution: The eccentric wheel connected by the driving device drives the connecting rod, which can generate pushing and pulling forces on the steel frame under the action of an earthquake to effectively offset part of the seismic force, reduce the damage of the earthquake to the core tube and the steel frame, and improve the seismic performance of the structure. The movement of the rack is transmitted to the driven rod through the gear, and then drives the eccentric wheel to rotate, which can convert the relative displacement generated by the earthquake into the internal movement of the driving device, realizing the effective absorption and dissipation of seismic energy. The transverse spring and the viscous damper on the connecting rod are used in combination to achieve a hierarchical response to the shaking of the building. When the shaking amplitude is small, the transverse spring mainly relies on the buffer; when the shaking amplitude is large, the viscous damper plays a major role to form a rigid connection to ensure the transmission of force. The reset device enables the connection node to automatically return to the initial state after an earthquake without external intervention, reducing the post-earthquake repair workload and improving the reliability of the structure. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the present invention;

[0022] Figure 2 It is a partial three-dimensional structure schematic diagram of the embedded fastener connected to the cross bar;

[0023] Figure 3 It is a partial three-dimensional structure schematic diagram of the cross bar connected to the connecting cylinder;

[0024] Figure 4 It is an exploded three-dimensional structure schematic diagram at the connecting cylinder;

[0025] Figure 5 It is a three-dimensional structure schematic diagram at the sliding groove;

[0026] Figure 6 It is a three-dimensional structure schematic diagram at the guiding cylinder;

[0027] Figure 7 is Figure 5 The partial enlarged structural schematic diagram at position A in

[0028] Wherein: 1. Core tube, 2. Steel frame, 3. Cross bar, 4. Longitudinal bar, 5. Embedded fastener, 6. Steel bracket, 7. Connecting tube, 8. Hinge seat, 9. Eccentric wheel, 10. Connecting rod, 11. Bracket, 12. Driven rod, 13. Gear, 14. Rack, 15. Sliding groove, 16. Sliding part, 17. Support plate, 18. Sleeve, 19. Longitudinal spring, 20. Guide tube, 21. Cover, 22. Limiting plate, 23. Transverse spring, 24. Friction type ratchet mechanism, 25. Viscous damper, 26. Upper hinge rod, 27. Lower hinge rod. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of this embodiment, it should be understood that the orientation or positional relationship indicated by the terms "center, longitudinal, transverse, up, down, front, back, left, right, vertical, horizontal, top, bottom, inner, outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0031] As Figures 1-3 shown, the present invention provides a connection node between a steel frame 2 and a core tube 1, including a core tube 1 and a steel frame 2. The steel frame 2 includes a cross bar 3 and a longitudinal bar 4. An embedded fastener 5 is provided in the core tube 1. The embedded fastener 5 is connected with a steel bracket 6. A connecting tube 7 is fixed on the steel bracket 6. The opening direction of the connecting tube 7 is perpendicular to the axis of the core tube 1. One end of the cross bar 3 slides along the connecting tube 7, and the other end is fixedly connected with the longitudinal bar 4. A hinge seat 8 is fixed on the side wall of the longitudinal bar 4. A driving device is provided in the connecting tube 7. The driving device is connected with an eccentric wheel 9. The eccentric wheel 9 is hinged with a connecting rod 10 through an eccentric shaft. The end of the connecting rod 10 far from the connecting tube 7 is hinged with the hinge seat 8. The connecting tube 7 is connected with the cross bar 3 through a reset device.

[0032] Construction method: During the construction stage of the core tube 1, high-strength embedded parts 5 are pre-embedded. The embedded parts 5 should be accurately installed at the designed positions to ensure their tight bonding with the concrete of the core tube 1; the steel corbels 6 are connected to the embedded parts 5 by high-strength bolts or welding, and during installation, the levelness and perpendicularity of the steel corbels 6 should be ensured to meet the design requirements to guarantee the installation accuracy of subsequent components; the connecting tube 7 is fixed on the steel corbels 6, and its opening direction is perpendicular to the axis of the core tube 1. Enough space should be reserved inside the connecting tube 7 to accommodate the driving device and the eccentric wheel 9; one end of the cross bar 3 is processed into a structure that can slide along the connecting tube 7, such as a slider or a guide rail form, and is inserted into the connecting tube 7. The other end of the cross bar 3 is fixedly connected to the longitudinal bar 4. An articulated seat 8 is fixed on the side wall of the longitudinal bar 4. A driving device is installed inside the connecting tube 7. The driving device is hinged to the connecting rod 10 through the eccentric shaft of the eccentric wheel 9. The other end of the connecting rod 10 is connected to the articulated seat 8 on the longitudinal bar 4. A reset device, such as a spring or an elastic element, is installed between the connecting tube 7 and the cross bar 3, which is used to restore the cross bar 3 to its initial position after an earthquake; after all components are installed, overall debugging is carried out to ensure the normal operation of the driving device and the reliable function of the reset device. The surface of the embedded parts 5 can be provided with protrusions or threads to enhance the anchoring force with the concrete.

[0033] Under normal working conditions, the cross bar 3 remains stationary along the connecting tube 7. The longitudinal bar 4 is connected to the connecting rod 10 through the articulated seat 8 to form a stable frame structure. The driving device is in a standby state, and at this time, the eccentric wheel 9 does not move. When an earthquake occurs, a relative displacement is generated between the core tube 1 and the steel frame 2. The cross bar 3 slides inside the connecting tube 7, triggering the start of the driving device. The driving device drives the eccentric wheel 9 to rotate. The rotation of the eccentric wheel 9 is transmitted to the connecting rod 10 through the eccentric shaft. The movement of the connecting rod 10 is transmitted to the longitudinal bar 4 through the articulated seat 8. The force generated by the movement of the connecting rod 10 pushes and pulls the longitudinal bar 4 to offset part of the earthquake force, thereby reducing the damage to the structure caused by the earthquake. After the earthquake ends, the reset device can restore the cross bar 3 to its initial position, and at the same time, the driving device stops working and the eccentric wheel 9 returns to its initial state. The entire connection node can return to the normal working state without external intervention after the earthquake, reducing the post-earthquake repair workload. Each component can be prefabricated and installed on-site conveniently, reducing the construction time and cost, and at the same time facilitating the later maintenance and replacement of components.

[0034] As Figures 3-7 shown, the driving device includes a bracket 11. The bracket 11 is fixed inside the connecting tube 7. A driven rod 12 rotates on the bracket 11. A gear 13 is fixed on the driven rod 12. A rack 14 meshing with the gear 13 is fixed on the cross bar 3. The rack 14 is arranged parallel to the cross bar 3. The driven rod 12 penetrates through the connecting tube 7, and the end of the driven rod 12 outside the connecting tube 7 is fixedly connected to the eccentric wheel 9.

[0035] In the normal state, the crossbar 3 remains stationary along the connecting cylinder 7, the rack 14 meshes with the gear 13, and the driven rod 12 and the eccentric wheel 9 do not move, ensuring the stability and safety of the building structure under normal use conditions, and avoiding unnecessary mechanical wear and energy consumption. When an earthquake occurs, a relative displacement is generated between the core tube 1 and the steel frame 2. The crossbar 3 slides within the connecting cylinder 7, driving the movement of the rack 14. The movement of the rack 14 is transmitted to the driven rod 12 through the gear 13. The rotation of the driven rod 12 drives the eccentric wheel 9 to rotate, and the relative displacement generated by the earthquake is converted into the internal movement of the drive device, achieving effective absorption and dissipation of seismic energy. The meshing of the gear 13 and the rack 14 ensures the accuracy and stability of the movement transmission. Compared with a direct sliding connection, it can more effectively control the movement of the crossbar 3 and reduce energy loss.

[0036] As Figure 5 shown, a plurality of sliding grooves 15 are provided on the crossbar 3. A plurality of spherical sliding members 16 are provided in each of the sliding grooves 15. The sliding members 16 commonly support a support plate 17. A sleeve 18 is fixed on the support plate 17. A longitudinal spring 19 is provided in the sleeve 18. A guide cylinder 20 is penetrated through the upper end of the connecting cylinder 7. The guide cylinder 20 is sleeved with the sleeve 18. A detachable cover 21 is provided at the top end of the guide cylinder 20. The top end of the longitudinal spring 19 abuts against the cover 21 through a pressure sensor. The pressure sensor is a prior art.

[0037] When the longitudinal seismic wave causes the longitudinal vibration of the building, the crossbar 3 will apply a thrust to the longitudinal spring 19, causing the longitudinal spring 19 to undergo elastic deformation, absorbing and dispersing the energy of the seismic wave, reducing the vibration amplitude of the building, helping to protect the building structure, and reducing the damage to the building caused by the earthquake. At the same time, the reading of the pressure sensor will change accordingly. By real-time monitoring and analysis of the pressure sensor data, the intensity of the earthquake and its impact on the building can be judged, providing an important basis for earthquake early warning and emergency response measures. By providing a plurality of spherical sliding members 16 in the sliding grooves 15, when the crossbar 3 undergoes displacement, the sleeve 18 has a certain displacement space during an earthquake, thereby reducing the friction force on the longitudinal spring 19 and helping to protect the longitudinal spring 19. After the earthquake, the longitudinal spring 19 can be quickly replaced and the pressure sensor can be maintained by removing the cover 21.

[0038] As Figures 3-6As shown, the reset device includes a limit plate 22, which is fixed at the open end of the connecting cylinder 7. The limit plate 22 abuts against the driving device through a lateral spring 23. The limit plate 22 is fixed at the open end of the connecting cylinder 7, effectively restricting the sliding range of the cross bar 3 within the connecting cylinder 7 and preventing structural instability or damage caused by excessive sliding of the cross bar 3 under the action of an earthquake or other external forces. After the action of an earthquake or other external forces disappears, the elastic force of the lateral spring 23 will push the cross bar 3 back to its initial position, restoring the connection between the steel frame 2 and the core tube 1 to the normal state. This not only helps to reduce the residual deformation of the structure after an earthquake, but also improves the self-recovery ability of the building structure, reduces the maintenance cost and time, and enables the building to resume normal use more quickly.

[0039] As Figure 5 , 7 shown, a friction ratchet mechanism 24 is provided on the driven rod 12, and the outer side of the friction ratchet mechanism 24 is fixedly connected to the connecting cylinder 7. The friction ratchet mechanism 24 is a prior art. The friction ratchet mechanism 24 can provide frictional resistance for the rotation of the driven rod 12, helping to reduce the sway amplitude of the building and improve the seismic performance of the structure.

[0040] As Figure 1 , 3 shown, the connecting rod 10 includes a viscous damper 25. One end of the viscous damper 25 is hinged to the eccentric wheel 9 through an upper hinge rod 26, and the other end is hinged to the hinge seat 8 through a lower hinge rod 27.

[0041] The viscous damper 25 can effectively consume seismic energy when the building sways through its viscous characteristics, thereby reducing the sway amplitude of the building. When the sway amplitude of the building is too large, the viscous damper 25 can form a rigid connection to ensure the effective transmission of force, avoid structural damage, and improve the overall seismic performance. When the sway amplitude of the building is small, the lateral spring 23 buffers the cross bar 3, reducing the dependence on the driving device. This can reduce the starting frequency and working load of the force driving device, extend its service life, and reduce the maintenance and replacement costs. The combined use of the lateral spring 23 and the viscous damper 25 realizes a hierarchical response to the sway of the building. When the sway amplitude is small, it mainly relies on the lateral spring 23 for buffering; when the sway amplitude is large, the viscous damper 25 plays a major role and forms a rigid connection to ensure the transmission of force.

[0042] As Figures 3-5As shown, both ends of the driven rod 12 penetrate through the connecting cylinder 7, and the two ends of the driven rod 12 are respectively hinged to the hinge seats 8 through the connecting rods 10. By providing two sets of connecting rods 10, the connecting nodes can distribute the load more evenly when stressed. And when the driving device is started, through the action of the eccentric wheel 9 and the connecting rods 10, the force can be transmitted to the steel frame 2 more efficiently, improving the force transmission efficiency, thereby enhancing the stability and seismic performance of the entire structure.

[0043] Structural components such as the connecting rods 10, bolts, springs, gears 13, and racks 14 are all made of high-strength steel, which not only improves the structural strength and load-bearing capacity, enhances the wear resistance and durability, but also improves the safety performance, reduces the weight, improves the energy efficiency, while improving the machining accuracy and manufacturing efficiency, and is suitable for harsh working environments.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A connection node between a steel frame and a core tube, comprising a core tube (1) and a steel frame (2), characterized in that: The steel frame (2) includes a cross bar (3) and a longitudinal bar (4). Embedded fasteners (5) are provided inside the core tube (1). The embedded fasteners (5) are connected to a steel corbel (6). A connecting cylinder (7) is fixed on the steel corbel (6). The opening direction of the connecting cylinder (7) is perpendicular to the axis of the core tube (1). One end of the cross bar (3) slides along the connecting cylinder (7), and the other end is fixedly connected to the longitudinal bar (4). A hinge seat (8) is fixed on the side wall of the longitudinal bar (4). A driving device is provided inside the connecting cylinder (7). The driving device is connected to an eccentric wheel (9). The eccentric wheel (9) is hinged to a connecting rod (10) through an eccentric shaft. The end of the connecting rod (10) away from the connecting cylinder (7) is hinged to the hinge seat (8). The connecting cylinder (7) is connected to the cross bar (3) through a reset device.

2. The connection node between the steel frame and the core tube according to claim 1, characterized in that: The driving device includes a bracket (11). The bracket (11) is fixed inside the connecting cylinder (7). A driven rod (12) rotates on the bracket (11). A gear (13) is fixed on the driven rod (12). A rack (14) meshing with the gear (13) is fixed on the cross bar (3). The rack (14) is arranged parallel to the cross bar (3). The driven rod (12) passes through the connecting cylinder (7). The end of the driven rod (12) outside the connecting cylinder (7) is fixedly connected to the eccentric wheel (9).

3. The connection node between the steel frame and the core tube according to claim 1, characterized in that: A plurality of sliding grooves (15) are provided on the cross bar (3). A plurality of spherical sliding members (16) are provided in each sliding groove (15). The sliding members (16) jointly support a support plate (17). A sleeve (18) is fixed on the support plate (17). A longitudinal spring (19) is provided inside the sleeve (18). A guide cylinder (20) penetrates through the upper end of the connecting cylinder (7). The guide cylinder (20) is sleeved with the sleeve (18). A detachable cover (21) is provided at the top of the guide cylinder (20). The top end of the longitudinal spring (19) abuts against the cover (21) through a pressure sensor.

4. The connection node between the steel frame and the core tube according to claim 1, characterized in that: The reset device includes a limit plate (22). The limit plate (22) is fixed at the opening end of the connecting cylinder (7). The limit plate (22) abuts against the driving device through a transverse spring (23).

5. The connection node between the steel frame and the core tube according to claim 2, characterized in that: A friction ratchet mechanism (24) is provided on the driven rod (12). The outer side of the friction ratchet mechanism (24) is fixedly connected to the connecting cylinder (7).

6. The connection node between the steel frame and the core tube according to claim 1, characterized in that: The connecting rod (10) includes a viscous damper (25). One end of the viscous damper (25) is hinged to the eccentric wheel (9) through an upper hinge rod (26), and the other end is hinged to the hinge seat (8) through a lower hinge rod (27).

7. The connection node between the steel frame and the core tube according to claim 2, characterized in that: Both ends of the driven rod (12) pass through the connecting cylinder (7). Both ends of the driven rod (12) are hinged to the hinge seat (8) through the connecting rod (10).

8. The construction method of the connection node between the steel frame and the core tube according to any one of claims 1-7, characterized in that, It includes the following steps: S1: During the construction stage of the core tube (1), embed high-strength embedded fasteners (5), and ensure their close combination with the core tube (1) concrete through secondary vibration. S2: Fix the steel corbel (6) to the embedded fasteners (5), and ensure the levelness and perpendicularity of the steel corbel (6) during installation. S3: Insert one end of the cross bar (3) into the connecting cylinder (7), fixedly connect the other end to the longitudinal bar (4), and install a hinge seat (8) at the end of the longitudinal bar (4) away from the cross bar (3). S4: Install a driving device inside the connecting cylinder (7). The driving device is hinged to the connecting rod (10) through the eccentric shaft of the eccentric wheel (9), and the other end of the connecting rod (10) is connected to the hinge seat (8) on the longitudinal rod (4); S5: Install a reset device between the connecting cylinder (7) and the cross bar (3) to restore the cross bar (3) to its initial position after an earthquake; S6: After installing all components, conduct overall debugging to ensure smooth movement of each component, normal operation of the driving device, and reliable function of the reset device.

Images